iPhone UIWebView: loadData does not work with certain types (Excel, MSWord, PPT, RTF)

Question

My task is to display the supported document types on an iPhone with OS 3.x, such as .pdf, .rtf, .doc, .ppt, .png, .tiff etc.

Now, I have stored these files

Answer 1

Here is solution via NSURLProtocol:

class CoreDataFileURLProtocol : NSURLProtocol {
    var connection: NSURLConnection!

    override class func canInitWithRequest(request: NSURLRequest) -> Bool {
        return (request.URL.scheme == "coredatafile")
    }

    override class func canonicalRequestForRequest(request: NSURLRequest) -> NSURLRequest {
        return request
    }

    override func startLoading() {
        if let file_id = self.request.URL.absoluteString?.lastPathComponent {
            if let file = SAFile.MR_findFirstByAttribute("file_id", withValue: file_id) as? SAFile {
                let response = NSURLResponse(URL: request.URL, MIMEType: file.mime, expectedContentLength: Int(file.filesize), textEncodingName: "utf-8")
                client?.URLProtocol(self, didReceiveResponse: response, cacheStoragePolicy: .NotAllowed)
                client?.URLProtocol(self, didLoadData: file.data)
                client?.URLProtocolDidFinishLoading(self)
            }
        }
    }

    override func stopLoading() {
    }
}

Now you need only register class:

NSURLProtocol.registerClass(CoreDataFileURLProtocol.self)

And create a request with file_id:

let url = NSURL(scheme: "coredatafile", host: "myapp.com", path: "/\(file.file_id)")
webView.loadRequest(NSURLRequest(URL: url!))